期刊
NATIONAL SCIENCE REVIEW
卷 9, 期 3, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwab087
关键词
high-order topological superconductivity; Majorana zero modes; iron-based superconductors
资金
- Office of Naval Research [N00014-18-1-2793]
- Kaufman New Initiative research grant of the Pittsburgh Foundation
- German Research Foundation (DFG) [DFG-SFB 1170]
- Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter - ct.qmat [EXC 2147, 39085490]
In this research, we propose to create Majorana zero modes (MZMs) without heterostructures in the FeTe1-xSex monolayer by applying an in-plane magnetic field and tuning the local chemical potential via electric gating. Our study not only reveals the FeTe1-xSex monolayer as a promising Majorana platform with scalability and electrical tunability, but also provides a general principle to search for realistic realization of high-order topological superconductivity.
Iron-based superconductors have been identified as a novel platform for realizing Majorana zero modes (MZMs) without heterostructures, due to their intrinsic topological properties and high-T-c superconductivity. In the two-dimensional limit, the FeTe1-xSex monolayer, a topological band inversion has recently been experimentally observed. Here, we propose to create MZMs by applying an in-plane magnetic field to the FeTe1-xSex monolayer and tuning the local chemical potential via electric gating. Owing to the anisotropic magnetic couplings on edges, an in-plane magnetic field drives the system into an intrinsic high-order topological superconductor phase with Majorana corner modes. Furthermore, MZMs can occur at the domain wall of chemical potentials at either one edge or certain type of tri-junction in the two-dimensional bulk. Our study not only reveals the FeTe1-xSex monolayer as a promising Majorana platform with scalability and electrical tunability and within reach of contemporary experimental capability, but also provides a general principle to search for realistic realization of high-order topological superconductivity.
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